[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 69
oint D as a centre, with C P,Fig. 5, as a radius, describe an arc cutting the curve in E ;draw D L equal H R, Fig. i, and E L equal C Y, Fig. 5 ;set off each way from B equal half the width of rail ; fromthe points describe the outside and inside curves. To find the angles to bevel the plank for… … STAIR BUILDING. 65 PLATE XXX ^Exhibits the plan of circular stairs cotitinued to the starting ofsecofid flight. To find the common pitch : Square up from A to B equaltwo risers ; join B C the pitch required ; set up from A toD equal three and one-half risers ; draw D E parallel toB C, and the…
Stair building
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